Any mods that'll improve visuals...?

[KobraKira]

...and improve the general optimization as well? I keep seeing some videos of mods that say it it improves the graphics AND optimizes the game itself as well. The only thing wrong about those videos are the fact that they don't include the name of the mod, not even in the description.

There's only one i found but i am a bit picky about it, especially because it doesn't say that it works for Crysis Warhead too: http://www.cryengine.com/community/downloads.php?view=detail&category=38&df_id=3065